Here is how things went for me in my current ironman Tuscany game. Obviously mileage will vary.
Day one declared war on Urbino taking the stab hit to avoid Aragon's shenanigans. Royal Marriaged Austria and improved relations to try to ally them so I can take on Venice when the time is right (plus they're emperor). I grab a Better Relations over time Advisor.
Started fabricating claim on Siena. Vassalized Urbino and declared on Siena. Also allied with Savoy as they can probably help when I go for Milan. While at war with Siena the pope decides to take on my vassal all by himself so I decide to teach him a lesson. Around this time Aragon gets a PU over Austria so I break my RM with Austria and start to kiss up with Castile in case they end up inheriting Aragon, Naples, and Austria.
During the Siena war the Pope declares on Urbino by himself. So I teach the Pope a lesson by taking Rome and forcing him to release Avignon. I vassalize Siena. Soon after I declare on the Pope and vassalize him.
As Curia controller I excommunicate Naples and call a crusade against Morocco. Eventually Aragon loses his PUs (why can't Aragon keep positive prestige even if they keep winning wars?), and Castille gets the Iberian Wedding... and refuses it (they had a Regency. Maybe that has something to do with it).
During a period of peace I annex the Pope, Urbino, and Siena. During this time Venice takes a province from Milan and takes Ferrara. I use a vassalize Modena mission and go to war with them and their ally Milan. Vassalize both.
Castile then calls me into a war over Grenada against Morocco, and the Ottomans. OP crusade bonuses kick in. I use this as my chance to take Ferrara from Venice and declare war on them. Savoy and Naples join on his side. Austria joins on mine. (note: Up to this point all my wars were just me and my vassals. My allies would not join any of them). I take a province from a weak Naples (if i remember correctly they were in a war against Aragon who had used the excommunicate CB). Peace out Savoy who was pretty weak thanks to wars. Fight back some Ottomans that are trying to mess around with me in Venice. Force Venice to return the province they took to Milan, as well as the Milanese province they start with. And annex Ferrara. Then I used a mission to Vassalize Mantua who was at war with Venice, causing me to break truce when I vassalized them (put me at -3 stability. Then I got Comet Sighted. Lol). But I peace out of that war quickly.
So currently I have Modena, Mantua, and Milan as vassals. Have used the Excommunicate CB to take another province from Naples. Naples and Venice have not been able to recover. They are constantly suffering wars after wars (even Venice used the Excommunicate CB against Naples. And Venice is under attack by a Hungarian-French alliance).
I'll probably just annex Milan, form Italy, and finish my playthrough since I just wanted the achievement.
Ideas I took Innotivative and Diplomatic. Innovative I rushed the first 3 ideas to get the -5% tech cost and unlock my first National idea (another -5% tech cost and idea cost). Then focused back on tech. Only putting points in ideas if I'm ahead of time, which is almost all the time. For military tech i've had to spend points even when ahead of time whenever I reached the 999 cap.
I love Tuscany. They have soooo many beneficial events.
Day one declared war on Urbino taking the stab hit to avoid Aragon's shenanigans. Royal Marriaged Austria and improved relations to try to ally them so I can take on Venice when the time is right (plus they're emperor). I grab a Better Relations over time Advisor.
Started fabricating claim on Siena. Vassalized Urbino and declared on Siena. Also allied with Savoy as they can probably help when I go for Milan. While at war with Siena the pope decides to take on my vassal all by himself so I decide to teach him a lesson. Around this time Aragon gets a PU over Austria so I break my RM with Austria and start to kiss up with Castile in case they end up inheriting Aragon, Naples, and Austria.
During the Siena war the Pope declares on Urbino by himself. So I teach the Pope a lesson by taking Rome and forcing him to release Avignon. I vassalize Siena. Soon after I declare on the Pope and vassalize him.
As Curia controller I excommunicate Naples and call a crusade against Morocco. Eventually Aragon loses his PUs (why can't Aragon keep positive prestige even if they keep winning wars?), and Castille gets the Iberian Wedding... and refuses it (they had a Regency. Maybe that has something to do with it).
During a period of peace I annex the Pope, Urbino, and Siena. During this time Venice takes a province from Milan and takes Ferrara. I use a vassalize Modena mission and go to war with them and their ally Milan. Vassalize both.
Castile then calls me into a war over Grenada against Morocco, and the Ottomans. OP crusade bonuses kick in. I use this as my chance to take Ferrara from Venice and declare war on them. Savoy and Naples join on his side. Austria joins on mine. (note: Up to this point all my wars were just me and my vassals. My allies would not join any of them). I take a province from a weak Naples (if i remember correctly they were in a war against Aragon who had used the excommunicate CB). Peace out Savoy who was pretty weak thanks to wars. Fight back some Ottomans that are trying to mess around with me in Venice. Force Venice to return the province they took to Milan, as well as the Milanese province they start with. And annex Ferrara. Then I used a mission to Vassalize Mantua who was at war with Venice, causing me to break truce when I vassalized them (put me at -3 stability. Then I got Comet Sighted. Lol). But I peace out of that war quickly.
So currently I have Modena, Mantua, and Milan as vassals. Have used the Excommunicate CB to take another province from Naples. Naples and Venice have not been able to recover. They are constantly suffering wars after wars (even Venice used the Excommunicate CB against Naples. And Venice is under attack by a Hungarian-French alliance).
I'll probably just annex Milan, form Italy, and finish my playthrough since I just wanted the achievement.
Ideas I took Innotivative and Diplomatic. Innovative I rushed the first 3 ideas to get the -5% tech cost and unlock my first National idea (another -5% tech cost and idea cost). Then focused back on tech. Only putting points in ideas if I'm ahead of time, which is almost all the time. For military tech i've had to spend points even when ahead of time whenever I reached the 999 cap.
I love Tuscany. They have soooo many beneficial events.